diff --git a/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/libpst/LibPstParser.java b/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/libpst/LibPstParser.java
index b34a9e3e18..83e88a38c7 100644
--- a/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/libpst/LibPstParser.java
+++ b/tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/libpst/LibPstParser.java
@@ -166,7 +166,7 @@ public void initialize(Map<String, Param> map) throws TikaConfigException {
             throw new TikaConfigException("path can't include null values");
         }
         String fullReadPstCommand = getFullReadPstCommand();
-        if (! Files.isRegularFile(Paths.get(fullReadPstCommand))) {
+        if (! StringUtils.isBlank(readPstPath) && ! Files.isRegularFile(Paths.get(fullReadPstCommand))) {
             throw new TikaConfigException("I regret I can't find the readpst executable: " + fullReadPstCommand);
         }
         try {